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optical axis |
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optical axis [′äp·tə·kəl ′ak·səs] (anatomy) An imaginary straight line passing through the midpoint of the cornea (anterior pole) and the midpoint of the retina (posterior pole). (optics) A line passing through a radially symmetrical optical system such that rotation of the system about this line does not alter it in any detectable way. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In the previous segmented ionization chamber, the collection plates and the high-voltage plates were repeated along the beam axis to divide the detector into regions. In-plane vibrometers measure movements perpendicular to the beam axis, similar to the laser surface velocimeter. Mark 2 sources and others agree that the linear drives tend to be heavy; which may limit them to use only on the horizontal beam axis (as is the case on the 32OELH). |
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